Hey guys hoping someone can help me out. My first build is on the road. Its extremely minimal with no speedo/tach etc. So i was hoping someone can ride their bike with stock gearing and let me know at 4000 rpm what speed in 1-5 gear are you traveling? Im gonna have my bro pace me so i can learn what the engine sounds like so ill have a rough idea what my engine is running at and how fast im going. Thanks a lot.
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Speed/RPM help
- Thread starter mikess
- Start date
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- Tags
- speed/rpm help
pamcopete
Ride.Enjoy.Life is Simple
Here is an Excel spreadsheet that will show RPM vs MPH for all combinations of sprockets, gears and tires. The yellow boxes are pull downs to select your numbers.
MPH vs RPM
MPH vs RPM
hotrdd
XS650 Junkie
If you have a newer Garmin GPS it has a whole dashboard setting on it that I used for a while.
Royboy
many roads, little time
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Wireless bicycle speedo. Totally tiny, self contained power, cheap and accurate, includes odometer, clock and other useless stuff. http://bontrager.com/model/08862
roy
roy
pamcopete
Ride.Enjoy.Life is Simple
mikess,
That's with stock 17/34 sprockets and an 18" wheel. You can use then pull downs to select other values.
That's with stock 17/34 sprockets and an 18" wheel. You can use then pull downs to select other values.
coughing skunk
XS650 Addict
If you've got some technical know how you could build a GPS speedo that displays speed by means of lights, or 7-seg displays with the following:
http://adafruit.com/products/746 - GPS module
http://www.digikey.com/product-detail/en/ATMEGA328P-PU/ATMEGA328P-PU-ND/1914589 - AVR Atmega 328p
You would need the supporting components for the uC, which is only a couple of resistors and caps plus a crystal and a voltage regulator. It is also breadboard/protoboard friendly if you don't have access to PCB printing. You would also need the LED's, or 7 seg displays, etc. Total build cost would be under $60 if prices are sourced right, and you'd have a 1 off speedo to boot.
If interested, I've built the guts of one (waiting on my buddy to machine the faceplate) with a program that captures the GPS data @ 10Hz and maps the speed to 40 LEDs that light up incrementally that you could leverage.
http://adafruit.com/products/746 - GPS module
http://www.digikey.com/product-detail/en/ATMEGA328P-PU/ATMEGA328P-PU-ND/1914589 - AVR Atmega 328p
You would need the supporting components for the uC, which is only a couple of resistors and caps plus a crystal and a voltage regulator. It is also breadboard/protoboard friendly if you don't have access to PCB printing. You would also need the LED's, or 7 seg displays, etc. Total build cost would be under $60 if prices are sourced right, and you'd have a 1 off speedo to boot.
If interested, I've built the guts of one (waiting on my buddy to machine the faceplate) with a program that captures the GPS data @ 10Hz and maps the speed to 40 LEDs that light up incrementally that you could leverage.
